Quantum Dot LCD Circadian-Friendly Display Technology

Abstract

A backlight for a display for emitting at least first and second emitted light, said backlight comprising a violet LED for emitting violet light, a cyan LED for emitting cyan light, red QDs (RQDs) for emitting red light, green QDs (GQDs) for emitting green light, a driver configured at least for driving said violet LED in a first mode, and driving said cyan LED in a second mode, wherein in said first mode, said violet LED is driven to emit said violet light, a portion of which is absorbed by said RQDs and said GQDs to emit said red light and green light respectively, said cyan LED is driven to emit said cyan light, a portion of which is absorbed by said RQDs and said SGQDs to emit said red light and short green light respectively.

What is claimed is: 
     
         1 . A backlight for a display for emitting at least first and second emitted light, said backlight comprising:
 a violet LED for emitting violet light;   a cyan LED for emitting cyan light;   red QDs (RQDs) for emitting red light;   green QDs (GQDs) for emitting green light;   a driver configured at least for driving said violet LED in a first mode, and driving said cyan LED in a second mode;   wherein in said first mode, said violet LED is driven to emit said violet light, a portion of which is absorbed by said RQDs and said GQDs to emit said red light and green light respectively, wherein first emission comprises at least a portion of said violet light said, red light and said green light; and   wherein in said second mode, said cyan LED is driven to emit said cyan light, a portion of which is absorbed by said RQDs and said SGQDs to emit said red light and short green light respectively, wherein second emission comprises at least a portion of said cyan light said red light and said green light.   
     
     
         2 . The backlight of  claim 1 , wherein said GQDs comprise:
 long Green QDs (LGQDs) for emitting long green light;   short Green QDs (SGQDs) for emitting short green light;   wherein first emission comprises at least a portion of said violet light said, red light and said long green light; and   wherein second emission comprises at least a portion of said cyan light said red light and said short green light.   
     
     
         3 . The backlight of  claim 1 , wherein said first emission has a first circadian stimulus (CS) less than half a second CS of said second emission. 
     
     
         4 . The backlight of  claim 1 , wherein said first emission has a first CS less than ⅓ or ¼ of a second CS of said second emission. 
     
     
         5 . The backlight of  claim 1 , wherein said first emission has an overall SPD power and a blue SPD power between 460 and 485 nm, wherein said blue SPD power is less than 2% of said overall SPD power. 
     
     
         6 . The backlight of  claim 1 , wherein said blue SPD power is less than 1% of said overall SPD power. 
     
     
         7 . The backlight of  claim 1 , wherein said second emission has an overall SPD power and a blue SPD power between 460 nm and 485 nm, wherein said blue SPD power is more than 10% of said overall SPD power. 
     
     
         8 . The backlight of  claim 1 , wherein said second emission has an overall SPD power and a blue SPD power between 460 nm and 485 nm, wherein said blue SPD power is more than 10% of said overall SPD power. 
     
     
         9 . The backlight of  claim 1 , wherein said violet LED has a peak wavelength between 395 and 440 nm. 
     
     
         10 . The backlight of  claim 1 , wherein said cyan LED has a peak wavelength between 470 and 520 nm. 
     
     
         11 . The backlight of  claim 1 , wherein said RQDs has a peak wavelength between 600 and 640 nm. 
     
     
         12 . The backlight of  claim 1 , wherein LGQDs has a peak wavelength between 530 and 580 nm. 
     
     
         13 . The backlight of  claim 1 , wherein said SGQDs has a peak wavelength between 500 and 540 nm. 
     
     
         14 . The backlight of  claim 1 , further comprising at least one QD Sheet comprising said RQDs, LGQDs, and SGQDs dispersed within a transparent matrix. 
     
     
         15 . The backlight of  claim 1 , wherein said driver comprises a control module for selecting between said first and second modes based on at least one of a real-time clock, ambient light sensor, user-defined setting, wireless signal, or a wearable device. 
     
     
         16 . The backlight of  claim 15 , wherein said driver uses data analysis techniques to determine the user's current body clock time. 
     
     
         17 . The backlight of  claim 1 , wherein said driver is configured to operate in a third mode in which both said violet and said cyan LEDs are powered. 
     
     
         18 . A display comprising said backlight of  claim 1 . 
     
     
         19 . The display of  claim 18 , further comprising:
 an LCD panel in front of said backlight.   
     
     
         20 . A display for emitting at least first and second emitted light, said display comprising:
 a violet LED for emitting violet light;   a cyan LED for emitting cyan light;   red QDs (RQDs) for emitting red light;   green QDs (GQDs) for emitting green light.   a driver configured at least for driving said violet LED in a first mode and driving said cyan LED in a second mode;   wherein in said first mode, said violet LED is driven to emit said violet light, a portion of which is absorbed by said RQDs and said GQDs to emit said red light and green light respectively, wherein first emission comprises at least a portion of said violet light said, red light and said green light; and   wherein in said second mode, said cyan LED is driven to emit said cyan light, a portion of which is absorbed by said RQDs and said SGQDs to emit said red light and short green light respectively, wherein second emission comprises at least a portion of said cyan light said red light and said green light.